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In geology, permafrost or cryotic soil is soil at or below the freezing point of water 0 °C (32 °F) for two or more years. Most permafrost is located in high latitudes. Overlying permafrost is a thin active layer that seasonally thaws during the summer. Plant life can be supported only within the active layer since growth can occur only in soil that is fully thawed for some part of the year. Kaktovik in North Slope Borough, Alaska,
This water looks dark there are rocks on the edge
one pit in gray brown round sand in nature in the forest
Rock in shape of elephant head and turquoise Soča river.
A stream of water is flowing through a rocky area. The water is murky and the rocks are jagged. The scene is somewhat desolate and the water appears to be polluted
Tasyaran Valley and Canyon, Usak, Turkey
Rocks near the sea
Details of Stones in a Clear Mountain Stream
Image of Small rock formations and alkaline in geyser of Yellowstone
Didymosphenia geminata more commonly known as Didymo or 'rock snot', an invasive freshwater algae, is a species of diatom that produces nuisance growths in freshwater rivers and streams with consistently cold water temperatures. Didymo is currently a huge biodiversity issue in New Zealand's South Island's cleanest water.
Sinkhole in rock-one hole filled with water in rock by Pedernales River in Texas USA
Geyser Creek in Saratoga Spa State Park, Saratoga Springs, New York, USA
An Unusual Deep Rock Hole Formation Carved Smooth out of the Granite Bedrock by the Crystal Clear Blue-Green Waters of the Pedernales River. At Pedernales State Park in Texas.
Stone in the river
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Close-up of ice and ripples in the Arkansas River as it flows through Buena Vista, Colorado, during winter.
Picturesque forest landscape near Vallocchie waterfall in Castel di Tora in Lazio in Italy
A fair-haired touring cyclist on a trip along the bottom of the Cerknica Lake. She looks at the sinkholes of the lake's sinkholes, where the lake's water flows out into the underground karst river.
Called the East Niagara Falls
Beautiful landscape of Dry Mountain or Suva Planina in Serbia
Blue Green Algae in Waimangu Volcanic Valley - New Zealand
Rock in the river.
Hole in a concrete wall. Gray concrete wall with a through hole.Split, crack and black hole in a concrete wall. Damage from natural disasters. Catastrophe. Damage to the wall, concrete structure.
Karakum Desert north of Darvaza, Dashoguz Province, Turkmenistan: Turquoise crater - a water filled sinkhole in a natural gas field, the result of a collapsed cavern. The water is rich in sulphur. Turkmenistan holds the world's 4th largest natural gas reserves.
The Rio Tinto in Huelva, Spain, exhibits striking red and orange iron-rich deposits and green microorganism traces
Riverbed of Little Pigeon River in Spring, Great Smoky Mountains National Park, USA
Cavaglia, Switzerland - July 22, 2020 : View of Giants pots in Cavaglia Glacier garden
spring in the mountain beside Nujiang River, Yunan Province, China.
View of the turquoise water of the river among the canyon with mountains and rocks. Industrial mining quarry for the extraction of chalk for use in industry
Images of the Port and the town of Methana, in Argosaronikos, Peloponnese, Methana, Greece
Free Images: "bestof:Prospect hole on the banks of a mineralized stream.jpeg check categories 2 September 2015 1 Prospect hole on the banks of a mineralized stream Subject"
Stream running through forrest glen.jpg
View of Jones hole national fish hatchery Utah.jpg
Swimming hole (1).jpg
Stream grayscale.jpg
Stream scenic.jpg
Rapid stream.jpg
Mountain stream (1).jpg
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Flathead river stream.jpg
Reflections in stream.jpg
Rock water stream.jpg
Stream in hill.jpg
Stream Chinese gardens.jpg
Stream in spring.jpg
Bear on banks of dog salmon creek.jpg
Farm cattle animals at watering hole.jpg
Blow hole at Dudley beach errupting.jpg
Small village along the banks of the river.jpg
Stream and mountain landscape.jpg
Stream in hill nature.jpg
Combat fishing along the banks of the Russian river.jpg
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Red water in a stream.jpg
Blue shiner habitat with stream.jpg
Canyon stream trees kootenai.jpg
Child fishes in stream.jpg
Brown bear in stream.jpg
Taking measurements for a stream profile.jpg
Tidewater contractors installing stream bedding.jpg
Channelized stream in Georgia (1).jpg
Moss on stones on stream.jpg
Stream and mountains in summer.jpg
Combat fishing along stream.jpg
BROWN_BEAR_FORDING_STREAM.jpg
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Visitors enjoy the pleasures of wildlife viewing along the banks of the river.jpg
Mountain stream early spring scenic.jpg
View from the steep banks of a small boat in the water below.jpg
The view spans across the tundra from the banks of the Tuluksak river.jpg
Waterfall stream running through mossy glen.jpg
Man and women dig a hole in the sand on the beach.jpg
Canyon stream trees kootenai on hill.jpg
Ice on stream in high mountains.jpg
Stream in spring time wild scenics.jpg
Smoke stream raising from a house fire.jpg
hole-in-the-wall-wyoming-valley-72350.jpg
cave-view-river-valley-out-of-828604.jpg
Children measuring hole to make sure it is deep enough for planting flowers.jpg
Wisconsin Medford stream river water park picnic.jpg
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Beautiful landscape of the stream with vegetation around it.jpg
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Videographer recording effects of acid mine runoff in stream.jpg
Stream meandering in prairie brush with storm clouds in distance.jpg
Pink flowers with bee.JPG
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drain-cleaning-water-down-sink-1551390.jpg
Favorite fishing hole on copper creek.jpg
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Masai Mara, Kenya (2015).jpg
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Pine_National_Scenic_River.jpg
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Meandering Chalatna creek.jpg
Sweet creek scenics.jpg
Ireland streams ardara.jpg
Mountains streams Zion.jpg
Streams canyons valleys.jpg
Streams moss leaves.jpg
Wooden bridge (1).jpg
Gfp-florida-st-sebastion-river-state-park-hole-in-the-clouds.jpg
Spring creek in Oregon.jpg
Ice lens on steam rocks.jpg
Pebble in flowing water.jpg
River creek in woods.jpg
Streams brooks meadows mosses.jpg
Streams brooks water moss leaves.jpg
Streams logs water riverbanks.jpg
Streams moss water forests rocks.jpg
Wooden bridge in the forest with water.jpg
Beautiful landscape of the channel with water weeds.jpg
View of spring runoff in wooded area.jpg
Steams brooks water moss leaves forests.jpg
Streams rocks water moss forrest trees.jpg
Sweet run on the blue ridge center for environmental stewardship.jpg
View of headwaters of the Chattahoochee river flowing through wooded area.jpg
Along the banks of the Colorado river.jpg
Gfp-florida-keys-key-largo-sea-bound-stream.jpg
Gfp-florida-keys-key-largo-stream-and-horizon.jpg
Gfp-illinois-beach-state-park-stream.jpg
Gfp-pennsylvania-sinnemahoning-state-park-stream-view.jpg
Waterfall_Trail_on_Fossil_Creek.jpg
Waterfall_Trail_on_Fossil_Creek.jpg
Gfp-florida-keys-marathon-key-mangroves.jpg
Waterfall_Trail_on_Fossil_Creek.jpg
Waterfall_Trail_on_Fossil_Creek.jpg
Gfp-florida-keys-key-largo-mangrove-creek.jpg
Aerial view of beaver creek.jpg
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